there pretty cheap. i sure u can search and find somewhere else for a few bucks cheaper but thats a pretty good price. u don't need the one with the wideband built in. thats only good if your gonna be driving around with a lab top open to look at your a/f ratio all the time. buy the regular box and the aem wideband o2 with the gauge this way u can wire the gauge into the box. that will allow u to have a gauge that u can see you a/f ratio and u can also data log your passes once u calibrate it to the box.
also on a side note the aem wideband uses a vw gti 1.8T o2 which is not as accurate as fjo's, innovative, or motec o2's. the aem usually .1-.2 off from the others.